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  1. #include <stdlib.h>
  2. #include <gtk/gtk.h>
  3.  
  4. static void destroy(GtkWidget*,GdkEvent*,gpointer);
  5. void change(GtkWidget*, GdkEvent*, gpointer);
  6.  
  7. gchar textinwindow[50] = "Press A Button";
  8.  
  9. int main (int argc, char *argv[])
  10. {
  11.     GtkWidget *window;
  12.     GtkWidget *label;
  13.  
  14.     gtk_init(&argc, &argv);
  15.  
  16.     window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  17.     gtk_window_set_title(GTK_WINDOW (window), "Hello World");
  18.     gtk_container_set_border_width(GTK_CONTAINER (window), 10);
  19.     gtk_widget_set_size_request(window, 200, 100);
  20.  
  21.     label = gtk_label_new(textinwindow);
  22.  
  23.     gtk_container_add(GTK_CONTAINER(window), label);
  24.  
  25.     gtk_widget_show_all(window);
  26.  
  27.     g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(destroy), NULL);
  28.     g_signal_connect(G_OBJECT(window), "key-press-event", G_CALLBACK(change), label);
  29.  
  30.     gtk_main();
  31.  
  32.     return 0;
  33. }
  34.  
  35. static void destroy(GtkWidget *window,GdkEvent *event, gpointer data)
  36. {
  37.     gtk_main_quit();
  38. }
  39.  
  40. void change(GtkWidget *widget, GdkEvent *event, gpointer why)
  41. {
  42.     sprintf(textinwindow, "You pressed a button!");
  43.     gtk_label_set_text(why, textinwindow);
  44. }